Expansion joint material



Patented June 20, 1939 UNITED STATES PATENT OFFICE EXPANSION JOINTMATERIAL poration of Ohio No Drawing. Application January 31, 1934,

Serial No. 709,187

4 Claims.

In the art it has been the practice to use ordinary asphaltic orbituminous materials in the preparation of expansion joints, and in manyof these cases, finely divided, saturated fibrous ma- 5 terial. Asphaltsof various kinds, except at a very low melting point and very highpenetration, at 32 F. become very brittle in winter, and the shock oftenbreaks this material, leaving the joint in a manner to destroy itsefficiency.

This invention relates to a treatment of the bituminous material with apolymerized oil, in order to add to the life of the asphalt orbituminous material and at the same time make the material more elastic.This may be accomplished by introducing in the bituminous material anyoil which will polymerize readily at a high heat. As

one example, ty'pifying a suitable oil, China-wood oil sets to ajelly-like mass when heated to about 500 F. and is suitable for carryingout the invention. By retarding the heating, this mass may be producedin a stringy consistency.

This case is a continuation in part of application Serial No. 76,904,(Patent No. 1,982,506) filed December 21, 1925.

The salient feature of my invention consists in either mixingpolymerized oil with the asphalt or else mixing unpolymerized oil withthe asphalt and subjecting the mixture to a temperature sufficient topolymerize the oil in the mix. By varying the temperature above thedegree necessary to polymerize the oil I am enabled to obtain variousresults.

This combination of materials may be effected by polymerized China-woodoil, employing varying proportions of the polymerized oil, one formulabeing five (5) per cent polymerized oil and ninety-five (95) per cent ofsuitable bituminous material, or varying proportions, increasing theproportion of polymerized oil and decreasing the proportion ofbituminous material, depending upon the consistency of the mass desired.Where it is desirable to incorporate any of the fibrous materialmentioned, percentages varying from three to twenty-five per cent may bereadily incorporated with mechanical mixers, known to the art. Acombination of materials which has been found to produce a satisfactoryexpansion joint consists in a mixture of five (5) per cent polymerizedChina-wood oil, eighty-five (85) per cent bituminous material and ten(10) per cent finely divided material.

The invention is not limited to the China-wood oil, as any oil, whetherof mineral, vegetable or animal origin, which polymerizes is suitable.Among other suitable oils, cotton seed oil, linseed oil, soya bean oil,cedar, castor oil, cocoanut oil, rape oil, neats-foot oil, corn oil,perilla oil, lard oil, fish oil (Menhaden, etc.), mutton fat, stearicacid, oleic acid, and the like, are enumerated as further specificexamples. Stearin pitch and cotton seed oil pitch may also be consideredas products containing various proportions of polymerized oils and whichwould therefore be suitable for the purpose intended.

By the addition of dryers in the oil, or the use of sulphur, thepolmerization may be somewhat hastened.

While I have described one preferred embodiment of the invention andenumerated other spe-' cific examples of a suitable oil, or the like, itwill be understood that such details are for the purpose of illustrationand not a limitation of the invention.

Neither do I wish to be limited to the fibrous matter mentioned, as manyother types of fibrous matter may be suitable. Also finely dividedmatter may be employed, if it is desirable that the entire mass bewaterproofed. The resulting product is one of an elastic nature and onewhich will prolong the life of the asphalt or bituminous material, andat the same time strengthen the binding material resulting from themixture.

After mixing this material, as outlined, in any suitable mechanicalmixer, it may be presented to pressing rolls, also previously known tothe art, suitable for reducing the batch to fiat sheets, then cuttingsaid sheets into strips, adapting the material for use as premouldedexpansion joints.

I claim:

1. A premoulded expansion joint consisting of a mixture of five (5) percent polymerized cotton-seed oil, eighty-five per cent bituminousmaterial and ten (10) per cent finely divided material.

2. A premoulded expansion joint comprising a mixture of polymerizedcotton-seed oil, bituminous material and finely divided fillingmaterial.

3. Expansion joint material comprising a mixture of polymerizedcotton-seed oil and bituminous material.

4. Expansion joint material comprising a mixture of polymerizedcotton-seed oil and-bituminous material, said oil having the characterof having been polymerized at high heat and set to a jelly-likeconsistency.

ALBERT C. FISCHER.

